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| Book/Report | FZJ-2018-06557 |
; ; ;
1994
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag
Jülich
Please use a persistent id in citations: http://hdl.handle.net/2128/20133
Report No.: Juel-2890
Abstract: The mechanical properties of ceramic materials are usually evaluated with small standard specimens (e.g 4,5 mm x 3,5 mm x 50 mm) manufactured out of components. The results are used to determine the mechanical behaviour of size effects. This work is concerned with the determination of mechanical properties of SiSiC-components with different shapes and length (400 to 1700 mm). They have been tested under 4-point bending loading at room temperature, wherefore two test facilities had been developed and built. The obtained results lead to the evaluation of a formalism for the transfer of the fracture strength from small specimens to bigger components. A transfer of the fracture strength between SiSiC-components depending on surface crack damage is given. The specimens need the same population of crack starting failures to get good results. This is possible when the specimens and the components have a minimum size like sticks or tubes with a dimension of 23 mm x 17 mm x 400 mm. The SiSiC-components failed due to of pores, Si-inclusions, not completly siliconized areas, during the grinding precracked SiC-particles and defects resulting of sandblasting. The second part of the thesis decribes dynamic and cyclodynamic 4-point-bending testresults to prove the influence of cyclic fatigue. On the behalf of those results obtained by room temperature there is no fatigue effects for the design of SiSiC-components.
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